Re: Standard or tight neck ?
Absolutely get the tight neck. Figure on about 10-12 thousanths of wall thickness and .0005 / side clearance. Call K&M Services for the neck turning tools. They have the nicest gizmo going. I own several and there's is the nicest I've seen. Not only a solid carbide mandrel, but the mandrel is also a reamer for removing the "dreaded donut" in your necks.
I can't immagine anyone paying to get a gun chambered and not getting the neck smaller than SAMMI.
If you have something that you disassemble and reassemble enough times, sooner or later, you'll have two!